Sensors and Actuators B, Chemical vol:181 pages:166-171
Readout through a microscope-based setup is one of the most prevalent optical detection
methods used in current digital (i.e. droplet-based) electrowetting-on-dielectric lab-on-chip devices.
The integration of waveguides on such devices allows further size and complexity reduction for
absorption, fluorescence and surface plasmon resonance based detection mechanisms.
In this paper, we show a straightforward method to integrate multimode polymer optical waveguides
on an EWOD device. A design is shown that allows droplets to be transported by EWOD actuation to a
gap between two opposing waveguides down to 300 micron in size, and engulf the integrated
waveguides. The resulting proof-of-concept system is validated using a gold nanoparticle based model